The office was first mentioned in 1438, and the title is derived from the royal castle of Marchmont, an older name for Roxburgh Castle in the Scottish Borders.
During the First War of Scottish Independence, she was captured by the English and imprisoned in a cage at Roxburgh Castle for circa four years.
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By order of King Edward I of England, she was then held prisoner in an iron or wooden cage exposed to the public view in Roxburgh Castle.
Sir Robert was appointed governor of Roxburgh Castle in 1399, in 1408 he was appointed a knight of the order of the Garter, and in 1410 was appointed Vice Admiral of England until his death.
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Part of the action takes place at Linlithgow Palace, where Robert promises to marry his daughter Margaret Stewart "to the knight who shall take that castle of Roxburgh out of the hands of the English".
In July 1352 he was made joint warden of the marches towards Scotland, and in September 1355 keeper of Roxburgh Castle and sheriff of Northumberland for two years.